Description:Limnology and Oceanography (L&O) has been published annually since 1956. The unifying theme of L&O is the understanding of aquatic ecosystems. Submissions are judged on the originality of their data, interpretations, and ideas, and on the degree to which these can be generalized beyond the particular aquatic ecosystem examined. Most L&O papers have a strong empirical component-laboratory and modeling studies must demonstrate relevance to natural environments; typically this means that they are bolstered by "real-world" data. According to the Science Citation Index, L&O is the most frequently cited journal in the fields of both limnology and oceanography.

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Abstract

Males of the calanoid copepod Pleuromamma piseki frequently have a conspicuous spermatophore within their body cavity. This species is a strong vertical migrator and males with spermathophores migrate to slightly shallower nighttime depths than males lacking them. It is suggested that those copepods with spermatophores are ready to mate and that they aggregate near the surface as an adaptation to increase their chances of finding a mate. During matting, this behavior may be superimposed on the other environmental cues which affect depth distributions and may complicate studies designed to determine the causes and benefits of migration patterns.